Shale reamer



J. L SANTMGU 198411,37@

SHALE REAMER Feb., 9, 1933,

Filed. Dec. 5, 1928 dma/WW.

0 aasseinbled to :the

when the blade is in its upper expanded position, the lower end portion 12e of the blade still projects into the lower part 13e of the recess; this lower recess part being overhung by part e of the body to prevent the lower end oftthe. bladefbeing torn lout of'thezbody. Also,'to gnide thebla'de during its movement from the position of Figure 2 to the position of Figure l, and to prevent its tilting out of the 1 recess during such 'movement, -the "blade may preferably be provided withaslot` parallel to the blade bearing surface l2b,.and a screw or stud 21 extends through that slot and into the body.y Afcompressionsprlng, seated at its lower end in a spring recess l2.6acts to move; the-:blaideinpvwardly tofthefpositionzofFignre;l-. i

.In i the -manufacture andfassembly of 'this reameniand Vwhen :the aseveralrp arts have been rpoint sh-ownin Figure 2, then a recess cover plate is placed overeach .recess .and blaide and :is 'awelded into :place This cover plate is preferably rectangular in itsfaspectiinfelevation aszshown inlFigure l, and segmentali'shapediinfsectione-aslshownin .the sectional views. These :cover hplates are LpreferablyeweldedIintoplace. When placed :up on fthe body? they :bear npen'jthe' body surfaces indicate .at 'aandl 36 (for .36 -see i the lower part ,f aFigure '2) arelpreferably Weldedz to: the ybodyaithronghzouti the extent of, or:complet-ely;` aroimd, cthosessurfaees. When :the 'covenplates .arefl thus weldedf'onithey-cov- -er allparts :dfz-therblade -irecesses except the lrecess openings through which the .cutting fedges'l2aprojects. lhe'linished reeessesmay -bewdescri'loed asflaterecessesfor lsliots, iwhich have 4op enings;` ormouthsl of lessery extent than :the recess length; a recess .rentirelyenclosed except fonits restrictedimouth. Andgwhen thc cover @platesare Weldedfon, Vrthey become in'=effectintegral:withfthe body. ;Rarticnla-rly are the icover platesestrongly :jtoined with-.the body hat theupper parts olfitheplates which `cove-r thenpperor;cuttingpartsiof theiblades. forfinstanceain thesectiondf Figure. B it will tbe-seentlrat the surfaces isyquite'broad. iRotary Teaming stresses applied ftorthe cutting edges of fthe i blades l fare typically :in a tdi-recztion lying. between a -1 tangential :and 'a z radial direction. The :ar-rowSY in "Figure '3 4'gives a typical indication. ,The :forces-thus Y applied to the Ablade :are transmitted `directly fto the .back wall lsurface .13a :of :the frecess. VThe atendency yto :twist the Ablade is vverysnrall'be- #cause of :the blade-being Vdirectly backed :up :by"thesbodyfsurace 13a. ;If,wunderf any circumstances, the force indicated at S should be #more vnearly tangential 'than indicated, rthere (if:eenrseiwouldftlienfbe.zsomeftendency 'atoxpull 'the'bladeoutlcf its irecess, ibut this :tendency:isiresistedby the overhanging parts `Oduand'lOefefcthebody.' Underthefsaine cirenmstances, :thereL-nray f be 'a iten dency to twist ior .rotate fthe :blade in @the body, orc'ingvits 4,aloi 0itudinal axis the bod havinor a longitudinally elongate recess which extends into YYthebody in aplanetangential to"a circle con- Acentric"withtlie body axis, said recess being entirely enclosed wit-hin the rbody except for a restricted blade protrusion opening which isfof.lesserilongitudinal extent than the recess and a blade-like cutter in the recess having a cutting edgeextensiblfethrough1the opening. v e

"2. .il reainer of :the character l described, comprising-a cylinidric andv substantially `solid be dy,5 rotatable :aboutaflongitudinal;;axis,f,the body havingalongitudinally elongate'and flat recess which extends into lthe. bodyi inaiplane tangential to v.a circle iconeentric .with the tbody. axisythef rearwall :ofcthe irecessiextendjing diagonallyl saidsrecess heil@ entirelyienlesed"within; the body except "lor :sa 4restricted vnio-nth'which opens, at the cylind-ric surface ofth-ezbodyr-anil which-is of; lesser longitndinaliextent thanthe recess,.a bladeelilfeentter in 'the' recesseand lisavingia diagonal" rearedgel suiriiacev bearing -bacl against the `said diagonalrecesszsurface, -said 4blade being longi Andinarlly sslidable .in

Lthe recess: and lravingza fcnttin-gz edge :proj ce#v i'tible t-fhren'gh'ithe restrictedmouth.

"'3. [A reamer `ci the cclraracter i' described, lcomprisinga1substantially gcyliridric bodyrro tatable .about ya longitudinal :Y axis, ftheibody having a longitudinally elongate recessiwhich 'extends into the vbodyin a pla-nef tangential to 1 circle concentrici withithe body axis; thet rear wall ofsaitl recessextending diagonallyi'to Ethe longitudinal '-bodywaxis, a :blade "likey cut# :ter in i the recessfand "havingia diagonal .i rear edge surf-ace :a-daptedto bear vback'fa'gainstfthe sai-d diagonall back surface of thef-recess,v and sai d. bla de being longitudinally--slid-able" inthe recess, :the .'body having recess` overhanging portions attop andfbottom of the recess which Serveto restrictthe opening or mouth of the recess,fandthe cutter having upper. and-lower fend pa rtswhicli engage behind-said overhanging portions topreventoutward removalvof the cutterithrough thermouth or opening of the recess. e

,4. An expanding reameroi the-character described comprising a substantially cylindrie body rotatable about-a longitudinal axis, a "longitudinally elongated recess extending :intothefbody in aiplane tangentialto a circle concentric with said longitudinal Vaxis and ending in a rear wall which is diagonal to said longitudinal axis,=the inner parts of said vrecess beingv of greater longitudinal extent than the opening or moutheofsaidfrecess-at to: thelongitndinallbodfy iaxis, i

the surface el the body, so as to provide upper and. lower overhanging parts ol the body above and below the inouth of the recess, a l1, lnjnl.' t rbt/A1 1: .lb dr o t c n -e tunel inoun ec in sau o y recess and slidable vertically therein, the cutter e having a diagonal rear edge surtace L/El.. which bears bac-lr Yflatly against the rear Wall surface ot the recess, a spring under the cuter te din g to nieve it upwardly and the cuter having upper and lower end parts adapted to lie in the upper and lower part ol' the recess behind said ovcrhan ging parts of the body.

An expanding reainer ol the character described comprising a substantially cylindrie body rotatable about longitudinal axis, a longitudinally elongated recess extending into the body in a plane tangential to a circle concentric with said longitudinal axis and cndii In a rear Wall which diagonal to said longitialinal airis, the inner parts of said recess being ot greater longitudinal extent than the opening or inouth of said recess at the sui-lace ol the body, so as to provide upper and lower overhanging parts o'l the body above and below the inouth of the recess, a

blade-lilo@ cutter mounted in said body recess and slidable vertically therein, the cutter blade hearingI a diagonal rear edge surface which bears baclr 'flatly against the rear Wall surface of the recess, a spring under the cutter tending to move it upwardly, and the cutter having upper and lower end parts adapted to lie in the upper and loiver part of the recess behind said overhanging parts of the body, the cutter also having a slot therethrough which entends in a direction parallel to its rear edge surface, anda guide pin mounted in the body and extending transversely through said slot.

G. ln a 'reainer of the character described, a substantially cylindric body rotatable about a longitudinal airis, said body having therein a cutter receiving recess which extends into the body in i plane tangential to a circle conf centric Wit-h said longitudinal axis, said recess bein g entirely enclosed Within the body except tor an opening or mouth in said tangential plane, and a cutter blade mounted in the recess and niovable diagonally therein to project a longitudinal cutting edge through the recess inoutb, said cutter being, except 'for its projected longitudinal edge, entirely Within the recess.

An expanding reainer ol the character descrilied, comprising a substantially cylindrio body rotatable about a longitudinal axis, body having therein a cutter receiving r which extends into the body from its periphery in a plane tan,f;'ential to a circle concentric with said longitudinal airis, said c 1 being entirely enclosed within the body except 'l'or a 'liront opening at the periphery ol the body, the recess having substantially parallel .side walls, being elongated lcngituu din olly ot the body, and having its rear Wall 

